A method and apparatus that enables specification of what search documents have to contain, where specification can have almost unlimited precision. The method allows specification directly using the proposed information location in information space or using other formats such as list of keywords or natural text, while method will translate it to information location in information space allowing user to easily check system understanding of his search specification and correct it.When matching documents are displayed, their information location is displayed and user might correct it according to his knowledge, allowing system to influence information about documents basing it on information from several users.